Adding use re 'debug'; for m/-?\p{Nd}/ and m/-?\p{Nd}{1}/ shows
$ perl5.12.2 junk
Compiling REx "-?\p{Nd}"
synthetic stclass "ANYOF[\-][+utf8::Nd]".
Final program:
1: CURLY {0,1} (5)
3: EXACT <-> (0)
5: ANYOF[{unicode}+utf8::Nd] (17)
17: END (0)
stclass ANYOF[\-][+utf8::Nd] minlen 1
Matching REx "-?\p{Nd}" against "1"
Matching stclass ANYOF[\-][+utf8::Nd] against "1" (1 chars)
Contradicts stclass... [regexec_flags]
Match failed
Doesn't match
Freeing REx: "-?\p{Nd}"
|
$ perl5.14.1 junk
Compiling REx "-?\p{Nd}"
synthetic stclass "ANYOF{i}[\-][{non-utf8-latin1-all}{unicode}{outside
+ bitmap}+utf8::Nd]".
Final program:
1: CURLY {0,1} (5)
3: EXACT <-> (0)
5: ANYOF[{unicode}{outside bitmap}+utf8::Nd] (16)
16: END (0)
stclass ANYOF{i}[\-][{non-utf8-latin1-all}{unicode}{outside bitmap}+ut
+f8::Nd] minlen 1
Matching REx "-?\p{Nd}" against "1"
Matching stclass ANYOF{i}[\-][{non-utf8-latin1-all}{unicode}{outside b
+itmap}+utf8::Nd] against "1" (1 bytes)
0 <> <1> | 1:CURLY {0,1}(5)
EXACT <-> can match 0 times out of 1
+...
0 <> <1> | 5: ANYOF[{unicode}{outside bitmap}0-9
+...+utf8::Nd](16)
1 <1> <> | 16: END(0)
Match successful!
Matches
Freeing REx: "-?\p{Nd}"
|
$ perl5.12.2 junk
Compiling REx "-?\p{Nd}{1}"
Final program:
1: CURLY {0,1} (5)
3: EXACT <-> (0)
5: CURLY {1,1} (19)
7: ANYOF[{unicode}+utf8::Nd] (0)
19: END (0)
minlen 1
Matching REx "-?\p{Nd}{1}" against "1"
0 <> <1> | 1:CURLY {0,1}(5)
EXACT <-> can match 0 times out of 1
+...
0 <> <1> | 5: CURLY {1,1}(19)
ANYOF[{unicode}0-9...+utf8::Nd] ca
+n match 1 times out of 1...
1 <1> <> | 19: END(0)
Match successful!
Matches
Freeing REx: "-?\p{Nd}{1}"
|
$ perl5.14.1 junk
Compiling REx "-?\p{Nd}{1}"
Final program:
1: CURLY {0,1} (5)
3: EXACT <-> (0)
5: CURLY {1,1} (18)
7: ANYOF[{unicode}{outside bitmap}+utf8::Nd] (0)
18: END (0)
minlen 1
Matching REx "-?\p{Nd}{1}" against "1"
0 <> <1> | 1:CURLY {0,1}(5)
EXACT <-> can match 0 times out of 1
+...
0 <> <1> | 5: CURLY {1,1}(18)
ANYOF[{unicode}{outside bitmap}0-9
+...+utf8::Nd] can match 1 times out of 1...
1 <1> <> | 18: END(0)
Match successful!
Matches
Freeing REx: "-?\p{Nd}{1}"
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